people who often stay up too late are more likely to die of heart disease, ___________a study.
| A. with the help of | B. because of |
| C. according to | D. as a result. |
people who often stay up too late are more likely to die of heart disease, ___________a study.
| A. with the help of | B. because of |
| C. according to | D. as a result. |